Mobil 1 AFE 0w-30, 4k mi; '24 Ford Bronco 2.7L EB 11k mi

I think the OAI one is more accurate. The dipstick smells strongly of fuel when I check the oil. It is consistent with @CarbonSteel ’s results with this engine too.
I know that OAI (Polaris/Horizon) uses gas chromatography to measure fuel dilution, they are ISO 17025 certified, and use all of the latest ASTM testing methodologies.

Does SPEEDiagnostix use gas chromatography or a flame test like Blackstone does? If the latter, given the subjectivity of the results from a flame test, this is why there is such a variation in the results.
 
I know that OAI (Polaris/Horizon) uses gas chromatography to measure fuel dilution, they are ISO 17025 certified, and use all of the latest ASTM testing methodologies.

Does SPEEDiagnostix use gas chromatography or a flame test like Blackstone does? If the latter, given the subjectivity of the results from a flame test, this is why there is such a variation in the results.
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I thought they did use GC and it was why I was using them since my OAI/horizon kits took 6 months to arrive for some reason.
 
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I thought they did use GC and it was why I was using them since my OAI/horizon kits took 6 months to arrive for some reason.
Not sure why there was such a discrepancy then, but I found nothing on the SPEEDiagnostix website about their ASTM or testing methods nor are the ISO 17025 certified. Polaris/Horizon (OAI) clearly lists theirs - https://www2.eoilreports.com/A2LA_2145-01

I buy my Polaris/Horizon (OAI) kits from Amsoil (https://www.amsoil.com/p/oil-analyzers-test-kit-non-postage-paid-oainppkit/) and never had an issue with delivery of the kits or any delays on the test results. They are $22.15 each with a preferred account which pays for itself in short order.

@Pablo can hook you up if interested.
 
I know that OAI (Polaris/Horizon) uses gas chromatography to measure fuel dilution, they are ISO 17025 certified, and use all of the latest ASTM testing methodologies.

Does SPEEDiagnostix use gas chromatography or a flame test like Blackstone does? If the latter, given the subjectivity of the results from a flame test, this is why there is such a variation in the results.
Howdy! 2001 Cherokee? Is this a project?
 
Howdy! 2001 Cherokee? Is this a project?
It was, but we finished it some time ago.

 
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Having lived in Anchorage for +/- 20 years, I can state with certainty that temperatures in the timeframes indicated for the oil changes will vary widely.
Looking at sample dates, they range from July to end of December, progressively getting (much) colder. By December, dailies will range from -15 to30 typically. Thus the wide fluctuation in fuel dilution.
 
The only fuel dilution of note was really in the one Oil Anaylzers/Horizon Sample and showed 3.3%. The speediagnostix from the same oil drain was 1.21%. Either SD reports fuel dilution low, horizon reports it high, or it’s all in the margin of error. Based on the other measurements I’m leaning strongly toward the first one. I do think I’m getting about 2-3% fuel dilution because the oil moves up on the dipstick .1-.2 quarts on a 6 quart sump shortly after an oil change and smell like gas.
 
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